Random access method, terminal equipment and computer storage medium

ABSTRACT

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present application relates to the field of radio communication technology, and discloses a random access method, a terminal equipment, and a computer readable storage medium, wherein the random access method includes: receiving configuration information for random access from a base station; determining available first physical random access channel transmission occasions (ROs) according to at least one configured CSI-RS based on the configuration information; and performing random access according to the available first ROs. The method of the embodiment of the present application enables the UE to determine the time-frequency resources for random access by the configured CSI-RS indication.

CROSS-REFERENCE TO RELATED APPLICATION

This application is based on and claims priority under 35 U.S.C. 119 toChinese Patent Application No. 201811296434.5 filed on Nov. 1, 2018 inChina National Intellectual Property Administration, the disclosure ofwhich is herein incorporated by reference in its entirety.

BACKGROUND 1. Field

The present application relates to the field of radio communicationtechnology, and in particular, to a random access method, a terminalequipment, and a computer storage medium.

2. Description of Related Art

To meet the demand for wireless data traffic having increased sincedeployment of 4G communication systems, efforts have been made todevelop an improved 5G or pre-5G communication system. Therefore, the 5Gor pre-5G communication system is also called a ‘Beyond 4G Network’ or a‘Post LTE System’. The 5G communication system is considered to beimplemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, soas to accomplish higher data rates. To decrease propagation loss of theradio waves and increase the transmission distance, the beamforming,massive multiple-input multiple-output (MIMO), Full Dimensional MIMO(FD-MIMO), array antenna, an analog beam forming, large scale antennatechniques are discussed in 5G communication systems. In addition, in 5Gcommunication systems, development for system network improvement isunder way based on advanced small cells, cloud Radio Access Networks(RANs), ultra-dense networks, device-to-device (D2D) communication,wireless backhaul, moving network, cooperative communication,Coordinated Multi-Points (CoMP), reception-end interference cancellationand the like. In the 5G system, Hybrid FSK and QAM Modulation (FQAM) andsliding window superposition coding (SWSC) as an advanced codingmodulation (ACM), and filter bank multi carrier (FBMC), non-orthogonalmultiple access (NOMA), and sparse code multiple access (SCMA) as anadvanced access technology have been developed.

The Internet, which is a human centered connectivity network wherehumans generate and consume information, is now evolving to the Internetof Things (IoT) where distributed entities, such as things, exchange andprocess information without human intervention. The Internet ofEverything (IoE), which is a combination of the IoT technology and theBig Data processing technology through connection with a cloud server,has emerged. As technology elements, such as “sensing technology”,“wired/wireless communication and network infrastructure”, “serviceinterface technology”, and “Security technology” have been demanded forIoT implementation, a sensor network, a Machine-to-Machine (M2M)communication, Machine Type Communication (MTC), and so forth have beenrecently researched. Such an IoT environment may provide intelligentInternet technology services that create a new value to human life bycollecting and analyzing data generated among connected things. IoT maybe applied to a variety of fields including smart home, smart building,smart city, smart car or connected cars, smart grid, health care, smartappliances and advanced medical services through convergence andcombination between existing Information Technology (IT) and variousindustrial applications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies such asa sensor network, Machine Type Communication (MTC), andMachine-to-Machine (M2M) communication may be implemented bybeamforming, MIMO, and array antennas. Application of a cloud RadioAccess Network (RAN) as the above-described Big Data processingtechnology may also be considered to be as an example of convergencebetween the 5G technology and the IoT technology.

Transmission in a radio communication system includes: transmission froma base station (gNB) to a user equipment (UE) (referred to as downlinktransmission) and the corresponding slot is referred to as a downlinkslot, and a transmission from the UE to the base station (referred to asuplink transmission) and the corresponding slot is referred as an uplinkslot.

In the downlink communication of a radio communication system, thesystem periodically transmits a synchronization signal and a broadcastchannel to the user through a synchronization signal block (SSB,synchronization signal/PBCH block), wherein the period is an SSBperiodicity, or referred to as the SSB burst periodicity. Meanwhile, thebase station will configure a physical random access channelconfiguration period (PRACH configuration period), and configures acertain number of random access transmission occasions (also referred asPRACH transmission occasion, RO) in this period and satisfies that allthe SSBs in an association period (i.e., a certain of time) can bemapped to the corresponding RO.

In a new radio (NR) communication system, the performance of randomaccess directly affects the user's experience before the establishmentof radio resource control, for example, in a random access procedure. Ina conventional radio communication system, such as LTE and LTE-Advanced,a random access is applied to multiple scenarios such as establishing aninitial link, a cell handover, re-establishing an uplink, and radioresource control (RRC) connection reconstruction. In addition, therandom access is divided into contention-based random access andcontention-free random access according to whether the user monopolizesthe preamble sequence resources. In the contention-based random access,in the procedure of attempting to establish an uplink link, each userselects a preamble sequence from a same preamble sequence resources, andmultiple users may select the same preamble sequence to transmit to thebase station, so the conflict resolution mechanism is an importantresearch direction in random access. How to reduce the conflictprobability and how to quickly resolve conflicts that have alreadyoccurred is a key indicator affecting the performance of random access.

The contention-based random access procedure in LTE-A is divided intofour steps, as shown in FIG. 1 . In step 1, a user randomly selects onepreamble sequence from a preamble sequence resource pool and transmitsit to a base station. The base station performs correlation detection onthe received signal to identify the preamble sequence transmitted by theuser. In step 2, the base station transmits a random access response(RAR) to the user, which includes a random access preamble sequenceidentifier, a timing advance command determined according to a timedelay estimation between the user and the base station, a cell-radionetwork temporary identifier (C-RNTI), and time-frequency resourcesallocated for the next uplink transmission of the user. In step 3, theuser transmits a third message (Msg3) to the base station according tothe information in the RAR. The Msg3 includes information such as a userterminal identifier and an RRC link request, wherein the user terminalidentifier is unique to the user and is used for conflict resolution. Instep 4, the base station transmits a conflict resolution identifier tothe user which includes the identifier of the user terminal that has wonthe conflict resolution. After detecting the identity of the user, theuser upgrades the temporary C-RNTI to the C-RNTI, and transmits an ACKsignal to the base station to complete the random access and wait forthe scheduling of the base station. Otherwise, the user will start a newrandom access after a delay.

For a contention-free based random access procedure, a preamble sequencemay be allocated to the user since the base station knows the useridentifier. Therefore, when transmitting the preamble sequence, the userdoes not need to randomly select the sequence, but uses the allocatedpreamble sequence. After detecting the allocated preamble sequence, thebase station transmits a corresponding RAR, which includes informationsuch as timing advance and uplink resource allocation. After receivingthe RAR, the user considers that the uplink synchronization has beencompleted and waits for further scheduling of the base station.Therefore, the contention-free based random access only includes twosteps: step 1 is to transmit a preamble sequence; and step 2 is totransmit an RAR.

The random access in LTE is applicable to the following scenarios:

1. initial access under RRC IDLE;

2. re-establish the RRC connection;

3. cell handover;

4. in the RRC connected state, downlink data arrives and requests arandom access (when the uplink is in non-synchronization);

5. in the RRC connected state, the uplink data arrives and requests arandom access (when the uplink is in non-synchronization or resourcesare not allocated to the scheduling request from the PUCCH resources);

6. location.

However, in a 5G NR system, there are random access resources based onassociation of the channel state information-reference signal (CSI-RS)and the RO, in addition to the random access resources based on theassociation of the SSB and the RO. Therefore, how to enable a UE todetermine the time-frequency resources (i.e., RO) for random accessthrough a CSI-RS based indication manner is a problem to be solved.

SUMMARY

The purpose of the present application is to solve at least one of theabove technical defects, and the following technical solutions areproposed:

In a first aspect, a random access method is provided, including:

receiving configuration information for random access from a basestation;

determining available first ROs according to at least one configuredchannel state information-reference signal (CSI-RS) based on theconfiguration information;

performing random access according to the available first ROs.

In a second aspect, a random access method is provided, including:

receiving configuration information for random access from a basestation;

determining available second ROs according to at least one configuredSSB based on the configuration information; and

performing random access according to the available second ROs.

In a third aspect, a terminal equipment is provided, including:

a first receiving module configured to receive configuration informationfor random access from a base station;

a first determination module configured to determine available firstROs, according to at least one configured channel state informationreference signal (CSI-RS), based on the configuration information;

a first access module configured to perform random access according tothe available first ROs.

In a fourth aspect a terminal equipment is provided, including:

a second receiving module configured to receive configurationinformation for random access from a base station;

a second determination module configured to determine available secondROs, according to at least one configured SSB, based on the configuredinformation; and

a second access module configured to perform random access according tothe available second ROs.

In a fifth aspect, a terminal equipment is provided, including a memory,a processor, and a computer program stored on the memory and operable onthe processor, wherein the random access method is implemented when theprocessor executes the program.

In a sixth aspect, a computer readable storage medium is provided, thecomputer readable storage medium stores a computer program, that, whenexecuted by a processor, implements the random access method describedabove.

The random access method provided by the embodiment of the presentapplication receives the configuration information for random accessfrom the base station, and provides the premise guarantee for thesubsequent random access; and determines the available first ROsaccording to the at least one configured CSI-RS based on theconfiguration information, so that the UE can determine thetime-frequency resources for random access through the indication of theconfigured CSI-RS, providing more ways of performing random access whilelaying the basis for subsequent random access; the random access isperformed according to the available first ROs, so that random access isquickly performed according to the ROs determined by the CSI-RS.

The random access method provided by the embodiment of the presentapplication receives the configuration information for random accessfrom the base station, and provides the premise guarantee for thesubsequent determination of the ROs; and determines the available thesecond ROs according to the configured at least one SSB based on theconfiguration information so that the UE can determine thetime-frequency resources for random access through the indication of theconfigured SSB, providing more ways of performing random access whilelaying the basis for subsequent random access; the random access isperformed according to the available first ROs, so that random access isquickly performed according to the ROs determined by the SSB, and the UEcan perform autonomous handover in the presence of long-rangeinterference, thereby increasing the probability of successful randomaccess.

The aspects and advantages of the present invention will be set forth inpart in the following description, or learned through the practice ofthe present application.

Before undertaking the DETAILED DESCRIPTION below, it may beadvantageous to set forth definitions of certain words and phrases usedthroughout this patent document: the terms “include” and “comprise,” aswell as derivatives thereof, mean inclusion without limitation; the term“or,” is inclusive, meaning and/or; the phrases “associated with” and“associated therewith,” as well as derivatives thereof, may mean toinclude, be included within, interconnect with, contain, be containedwithin, connect to or with, couple to or with, be communicable with,cooperate with, interleave, juxtapose, be proximate to, be bound to orwith, have, have a property of, or the like; and the term “controller”means any device, system or part thereof that controls at least oneoperation, such a device may be implemented in hardware, firmware orsoftware, or some combination of at least two of the same. It should benoted that the functionality associated with any particular controllermay be centralized or distributed, whether locally or remotely.

Moreover, various functions described below can be implemented orsupported by one or more computer programs, each of which is formed fromcomputer readable program code and embodied in a computer readablemedium. The terms “application” and “program” refer to one or morecomputer programs, software components, sets of instructions,procedures, functions, objects, classes, instances, related data, or aportion thereof adapted for implementation in a suitable computerreadable program code. The phrase “computer readable program code”includes any type of computer code, including source code, object code,and executable code. The phrase “computer readable medium” includes anytype of medium capable of being accessed by a computer, such as readonly memory (ROM), random access memory (RAM), a hard disk drive, acompact disc (CD), a digital video disc (DVD), or any other type ofmemory. A “non-transitory” computer readable medium excludes wired,wireless, optical, or other communication links that transporttransitory electrical or other signals. A non-transitory computerreadable medium includes media where data can be permanently stored andmedia where data can be stored and later overwritten, such as arewritable optical disc or an erasable memory device.

Definitions for certain words and phrases are provided throughout thispatent document, those of ordinary skill in the art should understandthat in many, if not most instances, such definitions apply to prior, aswell as future uses of such defined words and phrases.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumerals represent like parts:

FIG. 1 illustrates a schematic diagram of a random access procedure inthe prior art;

FIG. 2 illustrates a schematic flowchart of a random access methodaccording to an embodiment of the present application;

FIG. 3 illustrates a schematic diagram of indexing at least one RO in aindexing time period according to an embodiment of the presentapplication;

FIG. 4 illustrates still another schematic diagram of indexing at leastone RO in a indexing time period according to an embodiment of thepresent application;

FIG. 5 illustrates another schematic diagram of indexing at least one ROin a indexing time period according to an embodiment of the presentapplication;

FIG. 6 illustrates a schematic flowchart of a random access methodaccording to still another embodiment of the present application;

FIG. 7 illustrates a schematic diagram of a basic structure of aterminal equipment according to an embodiment of the presentapplication;

FIG. 8 illustrates a schematic diagram of a basic structure of aterminal equipment according to still another embodiment of the presentapplication; and

FIG. 9 illustrates a block diagram of a computing system that can beused to implement a user equipment disclosed in an embodiment of thepresent invention.

DETAILED DESCRIPTION

FIGS. 1 through 9 , discussed below, and the various embodiments used todescribe the principles of the present disclosure in this patentdocument are by way of illustration only and should not be construed inany way to limit the scope of the disclosure. Those skilled in the artwill understand that the principles of the present disclosure may beimplemented in any suitably arranged system or device.

Embodiments of the present invention will be described in detailhereafter. The examples of these embodiments have been illustrated inthe drawings throughout which same or similar reference numerals referto same or similar elements or elements having same or similarfunctions. The embodiments described hereafter with reference to thedrawings are illustrative, merely used for explaining the presentinvention and should not be regarded as any limitations thereto.

It should be understood by those skill in the art that singular forms“a”, “an”, “the”, and “said” may be intended to include plural forms aswell, unless otherwise stated. It should be further understood thatterms “include/including” used in this specification specify thepresence of the stated features, integers, steps, operations, elementsand/or components, but not exclusive of the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or combinations thereof. It should be understood thatwhen a component is referred to as being “connected to” or “coupled to”another component, it may be directly connected or coupled to otherelements or provided with intervening elements therebetween. Inaddition, “connected to” or “coupled to” as used herein may includewireless connection or coupling. As used herein, the term “and/or”includes all or any one of one or more associated listed items orcombinations thereof.

In order to make the objects, technical solutions and advantages of thepresent application clearer, the embodiments of the present applicationwill be further described in detail below with reference to theaccompanying drawings.

Further, in some communication systems, such as a communication systemin which remote interference management (RIM) is considered, when a cellbase station receives a random access signal in its own cell, it may beinterfered by other base stations from other cells. As a result, thesuccess rate of reception is very low, and a lot of accesses of the userfail. Therefore, how to improve the random access success rate of theuser in the case of long-range interference is a problem to be solved.

The random access method, terminal equipment and computer readablestorage medium provided by the present application are intended to solvethe above technical problem of the prior art.

The technical solutions of the present application and how to solve theabove technical problem are described in detail in the followingspecific embodiments. The following specific embodiments may be combinedwith each other, and the same or similar concepts or processes may notbe described in some embodiments. Embodiments of the present applicationwill be described below with reference to the accompanying drawings.

Wherein, a time domain unit (also referred to as a time unit) in thepresent application may be: one OFDM symbol, one OFDM symbol group(consisting of multiple OFDM symbols), one slot, one slot group(consisting of multiple slots), one subframe, one subframe group(consisting of multiple subframes), one system frame, one system framegroup (consisting of multiple system frames); it may be an absolute timeunit, such as 1 millisecond, 1 second, etc.; the time unit could be acombination of multiple granularities, such as N1 slots plus N2 OFDMsymbols.

In addition, the frequency domain unit in the present application maybe: one subcarrier, one subcarrier group (consisting of multiplesubcarriers), one resource block (RB) (it could be referred to as onephysical resource block (PRB)), one resource block group (consisting ofmultiple RBs), one bandwidth part (BWP), one bandwidth part group(consisting of multiple BWPs), one bandwidth/carrier, and one bandwidthgroup/carrier group; it could be an absolute frequency domain unit, suchas 1 Hz, 1 kHz, etc.; the frequency domain unit could be a combinationof multiple granularities, such as M1 PRBs plus M2 subcarriers.

An embodiment of the present application provides a random accessmethod, as shown in FIG. 2 , including: Step S210: receivingconfiguration information for random access from a base station; StepS220: determining available first ROs according to at least oneconfigured CSI-RS based on the configuration information; and Step S230:performing random access according to the available first ROs.

Compared with the prior art, the random access method provided by theembodiment of the present application receives the configurationinformation for random access from the base station, and provides thepremise guarantee for the subsequent random access; the available firstROs according to the at least one configured CSI-RS based on theconfiguration information are determined, so that the UE can determinethe time-frequency resources for random access through the indication ofthe configured CSI-RS, providing more ways of performing random accesswhile laying the basis for subsequent random access; the random accessis performed according to the available first ROs, so that random accessis quickly performed according to the ROs determined by the CSI-RS.

Specifically, the determining the available first ROs according to atleast one configured CSI-RS based on the configured information,includes:

determining a indexing time period of the ROs based on the configurationinformation;

determining the available first ROs according to the at least oneconfigured CSI-RS based on the indexing time period.

Further, the determining the available first ROs according to the atleast one configured CSI-RS based on the indexing time period, includes:

determining a target CSI-RS for determining the ROs according to the atleast one configured CSI-RS;

determining the available first ROs associated to the target CSI-RSaccording to the indexing time period and the index of the at least oneROs mapped by the target CSI-RS.

Further, the determining the target CSI-RS for determining the ROsaccording to the at least one configured CSI-RS, including any one ofthe following situations:

If there is one configured CSI-RS, the configured CSI-RS is determinedas the target CSI-RS;

if there are multiple configured CSI-RSs, any CSI-RS selected randomlyfrom the multiple CSI-RSs with a medium probability is determined as thetarget CSI-RS;

determining the CSI-RS having the highest reference signal receivedpower among the multiple CSI-RSs as the target CSI-RS.

Further, the determining the available first ROs associated to thetarget CSI-RS based on the indexing time period and an index of the atleast one RO mapped by the target CSI-RS, including:

indexing at least one RO in each indexing time period according to apredetermined manner respectively to obtain a time-frequency resourcelocation associated to each RO, wherein the RO is characterized by anindex, and the initial index of the RO in each indexing time period isreset;

determining the time-frequency resource location of the available firstROs associated to the target CSI-RS based on an index of at least one ROmapped by the target CSI-RS or based on a predefined associationrelationship between the CSI-RS and the RO and an index of at least oneRO mapped by the target CSI-RS.

Further, the determining a indexing time period of the RO based on theconfiguration information, including any one of the following:

determining first association information from synchronization signalblock (SSB) to ROs and second association information from the CSI-RS tothe ROs, the first association information comprises an associationperiod from SSB to ROs and/or an association pattern period from the SSBto the ROs, the second association information includes an associationperiod from CSI-RS to ROs and/or an association pattern period from theCSI-RS to the ROs;

obtaining a PRACH configuration period from the configurationinformation;

computing a time duration in which each CSI-RS configured in one CSI-RSperiod is completely mapped to a corresponding RO, according to theconfiguration information;

computing a time duration in which each SSB configured in one SSB periodis completely mapped to a corresponding RO, according to theconfiguration information.

Further, the indexing time period includes any one of the following:

an association period from the CSI-RS to the RO;

an association pattern period from the CSI-RS to the RO;

an association period from the SSB to the RO;

an association pattern period from the SSB to the RO;

a PRACH configuration period;

a time duration in which each CSI-RS configured in one CSI-RS period iscompletely mapped to a corresponding RO; and

a time duration in which each SSB configured in one SSB period iscompletely mapped to a corresponding RO.

Further, the indexing at least one RO in each indexing time periodaccording to a predetermined manner, respectively, to obtain the timefrequency resource location associated to each RO, including any one ofthe following cases:

indexing indexes of all the ROs in each indexing time period accordingto the predetermined manner;

for any indexing time period, selecting valid ROs from ROs in theindexing time period based on a predetermined selection rule, andindexing indexes of the valid ROs according to the predetermined manner;

for any indexing time period, selecting valid ROs from ROs in theindexing time period based on a predetermined selection rule, andselecting ROs to be indexed from the valid ROs, and indexing indexes ofthe ROs to be indexed according to the predetermined manner.

Further, the selecting ROs to be indexed from the valid ROs, including:

selecting ROs to be indexed from the valid ROs according to the minimumnumber of valid ROs in each indexing time period and the time-frequencyresource locations of the minimum number of valid ROs in thecorresponding indexing time period.

Further, the performing random access according to the valid ROs,includes:

if there is one time-frequency resource location of available first ROs,then performing random access according to the first ROs; or

if there are multiple time-frequency resource locations of availablefirst ROs, then performing one or more of the following operations:

determining an index with the lowest index value in the available firstROs associated to multiple time-frequency resource locations, andperforming random access according to the ROs with the lowest indexvalue;

randomly selecting any first ROs from the valid first ROs associated tomultiple time-frequency resource locations with a medium probability,and performing random access according to any first ROs;

determining the first available first ROs in the available first ROsassociated to multiple time-frequency resource locations, and performingrandom access according to the first available first ROs, wherein thefirst available first ROs are the first available first ROs after a UEcompletes a preparation of transmission of random access preambles.

Further, specifically, the configuration information includes one ormore of random access configuration information, SSB configurationinformation or CSI-RS configuration information.

The random access configuration information includes one or more of thefollowing:

PRACH configuration period; frequency-domain unit index of ROs;time-frequency unit index of ROs; number of ROs; format of random accesspreamble; number of random access preambles; root sequence index ofrandom access preamble; cyclic shift value of random access preamble;number of SSBs that can be mapped on one RO; index of at least oneCSI-RS for random access; number of ROs mapped by one CSI-RS; or indexof at least one RO mapped by one CSI-RS.

The SSB configuration information includes one or more of the following:

size of SSB period; number of SSBs transmitted in one SSB period;indexes of SSBs transmitted in one SSB period; time unit locations ofSSBs transmitted in one SSB period; or frequency-domain unit locationsof SSBs transmitted in one SSB period.

The CSI-RS configuration information includes at one or more of thefollowing:

size of CSI-RS period; number of CSI-RSs transmitted in one CSI-RSperiod; indexes of CSI-RSs transmitted in one CSI-RS period; time unitlocations of CSI-RSs transmitted in one CSI-RS period; orfrequency-domain unit locations of CSI-RSs transmitted in one CSI-RSperiod.

In the following, the random access method of the foregoing embodimentof the present application is described in a comprehensive and detailedmanner:

In a communication system of 5G-NR, in addition to the SRB-based RO,there is also a CSI-RS-based RO configuration, therefore the UE needs toobtain a method based on an association from CSI-RS to RO to obtain anavailable RO method to implement the random access.

Specifically, in this embodiment, the UE obtains configurationinformation of the network from the network side through systeminformation or RRC configuration message or the downlink controlchannel, including one or more of the following:

random access configuration information, including one or more of thefollowing:

PRACH configuration period;

time unit index of RO (such as slot index, symbol index, subframe index,etc.);

frequency domain unit index of RO (such as carrier index, BWP index, PRBindex, subcarrier index, etc.);

number of ROs;

format of random access preamble (such as cyclic prefix (CP) length,preamble sequence length and repetition number, guard interval (GT)length, used subcarrier size, etc.);

number of random access preambles, the index of the root sequence, andthe cyclic shift value;

number of SSBs that can be mapped on one RO;

one or more CSI-RS indexes for random access;

number of ROs mapped by one CSI-RS;

one or more RO indexes mapped by one CSI-RS;

SSB configuration information, including one or more of the following:

size of SSB period;

number of SSBs transmitted in one SSB period;

indexes of the SSBs transmitted in one SSB period;

time unit locations of the SSBs transmitted in one SSB period;

frequency domain unit locations of the SSBs transmitted in one SSBperiod;

CSI-RS configuration information, including one or more of thefollowing:

size of CSI-RS period;

number of CSI-RSs transmitted in one CSI-RS period;

indexes of the CSI-RSs transmitted in one CSI-RS period;

time unit locations of the CSI-RSs transmitted in one CSI-RS period; or

frequency domain unit locations of the CSI-RSs transmitted in one CSI-RSperiod.

The UE may obtain the association information from the SSB to the RObased on the foregoing configuration information, which includes one ormore of the following:

association period from SSB to RO (for example, the number of PRACHconfiguration period required to complete at least one association fromSSB to RO);

association pattern period from SSB to RO (for example, a time durationthat ensure the associations from SSB to RO in the two adjacentassociation pattern period are exactly the same, for example, number ofrequired association periods from SSB to RO, or number of required PRACHconfiguration period).

The UE may obtain association information from the CSI-RS to the RObased on the foregoing configuration information, which includes one ormore of the following:

association period from CSI-RS to RO (for example, the number of PRACHconfiguration periods required to complete all the associations fromCSI-RS to RO in at least one CSI-RS period);

association pattern period from CSI-RS to RO (for example, a timeduration that ensure the associations from CSI-RS to RO in the twoadjacent association pattern periods are exactly the same, for example,the number of required association periods from CSI-RS to RO, or thenumber of required PRACH configuration period).

The UE determines a CSI-RS index for determining a RO by configuring oneor N (N>1) CSI-RS indexes for random access:

if the UE obtains a CSI-RS index for random access, then determining touse the CSI-RS index to determine to determine random access resources;

If the UE obtains N CSI-RS indexes for random access, the UE may:

randomly selecting one CSI-RS index from the N CSI-RS indexes with equalprobability, and determining to use the CSI-RS index to determine todetermine random access resources;

selecting a CSI-RS index with the highest reference signal receivedpower (RSRP) from the N CSI-RS indexes, and determining to use theCSI-RS index to determine the random access resources.

The UE determines the available ROs according to the associationrelationship from the CSI-RS to the RO (i.e., to specify the locationand number of ROs associated to a given CSI-RS according to one or moreRO indexes mapped by one configured CSI-RS), that is to determine one ormore ROs (PRACH occasion ROs) currently available for the selectedCSI-RS; wherein the UE indexes all the ROs configured in one indexingtime period according to a predefined manner (for example, a manner offrequency domain first and then the time domain in the presentapplication, or a manner of time domain first and then frequency domain)according to the indication of the random access configurationinformation; the indexing of the ROs will be reset per indexing timeperiod (i.e., indexing starting from zero again); wherein the indexingtime period may be:

time duration (for example, the number of OFDM symbols, the number ofslots, etc.) in which all CSI-RSs configured for the UE in one CSI-RSperiod are completely mapped to the corresponding ROs; which may be alsoreferred as to an association circle from the CSI-RS to RO;

PRACH configuration period;

association period from CSI-RS to RO;

association pattern period from CSI-RS to RO;

in particular, the indexing time period could be an association periodfrom SSB to RO;

in particular, the indexing time period could be an association patternperiod from SSB to RO;

in particular, the indexing time period could be a time duration (forexample, the number of OFDM symbols, the number of slots, etc.) in whichall the SSBs configured in one SSB period are completely mapped to thecorresponding RO; or it may also be referred as to an association circlefrom SSB to RO.

As shown in FIG. 3 , FIG. 3 is an exemplary indexing diagram of indexingthe indexes of all ROs configured in a PRACH configuration period andresetting the sequence of the ROs indexes in different PRACHconfiguration periods.

Specifically, all the ROs configured in the foregoing one time periodmay be valid ROs determined after a certain judging rule (i.e., apredetermined selection rule), and the judging rule may be determined bythe UE based on uplink and downlink configuration information configuredby the network equipment and/or the SSB configuration information, forexample, the UE determines:

1. the RO obtained from the random access configuration is only in oneuplink and downlink configuration period, and the part indicated by theuplink and downlink configuration information as the uplink is a validRO;

2. the RO obtained from the random access configuration is only in oneuplink and downlink configuration period, and the part indicated by theuplink and downlink configuration information that is not downlink is avalid RO;

3. the RO obtained from the random access configuration is only oneuplink time configuration period, and it is a valid RO after one or moretime units after the part indicated as the downlink in the uplink anddownlink configuration information; or

4. the RO obtained from the random access configuration is only in oneuplink and downlink configuration period, and it is a valid RO after oneor more time units after the last SSB indicated as the SSB configurationinformation in the uplink and downlink configuration information.

As shown in FIG. 4 , FIG. 4 is an exemplary indexing diagram of indexingand indexing valid ROs in one PRACH configuration period and resettingthe sequence of the RO indexes in different PRACH configuration periods.

In particular, the indexing may be performed according to the minimumnumber of valid ROs in the time period, that is, indexing with theminimum number of valid ROs in all the time periods. As shown in FIG. 5, even in the second PRACH configuration period, the first 4 ROs shouldbe valid, but should be indexed based on the 4 ROs obtained in the firstPRACH configuration period.

The UE determines the ROs available to the UE according to theconfigured RO index and the available RO obtained by the aboveassociation relationship, and performs random access according to theROs:

if the UE obtains only one RO index configuration for one CSI-RS, the UEdetermines that the RO performs random access preamble transmission forthe selected RO;

if the UE obtains a configuration of N (N>1) RO indexes for one CSI-RS,then the UE:

selects the RO with the lowest RO index value to transmit the randomaccess preamble;

randomly selects one RO from N ROs with equal probability to transmitthe random access preamble;

selects the first available RO in the N ROs to transmit the randomaccess preamble; the first available RO refers to the first available ROafter the UE is ready to transmit the random preamble.

Another embodiment of the present application provides a random accessmethod, as shown in FIG. 6 , includes: Step S610: receivingconfiguration information for random access from a base station; StepS620: determining the available second ROs according to at least oneconfigured SSB based on the configuration information; and Step S630:performing random access according to the available second ROs.

Compared with the prior art, the random access method provided by theembodiment of the present application receives the configurationinformation for the random access from the base station, and providesthe premise guarantee for the subsequent determination of the ROs; andthe available the second ROs according to the configured at least oneSSB based on the configuration information are determined, so that theUE can determine the time-frequency resources for random access throughthe indication of the configured SSB, providing more ways of performingrandom access while laying the basis for subsequent random access; therandom access is performed according to the available first ROs, so thatrandom access is quickly performed according to the ROs determined bythe SSB, and the UE can perform autonomous handover in the presence oflong-range interference, thereby increasing the probability ofsuccessful random access.

Specifically, the configuration information includes one or more ofrandom access configuration information for no long-range interference,random access configuration information for presence of long-rangeinterference, or SSB configuration information.

Further, the determining available second ROs according to at least oneconfigured SSB based on the configuration information, includes:

determining third association information between SSB and ROs accordingto first configuration information or second configuration information,the first configuration information includes current random accessconfiguration information for no long-range interference and the SSBconfiguration information, the second configuration information includescurrent random access configuration information for presence oflong-range interference and the SSB configuration information;

determining available second ROs according to at least one configuredSSB based on the third association information.

Further, before determining available second ROs according to at leastone configured SSB based on the third association information, furtherincludes:

initiating random access preamble transmission counter, preamble powerramping counter and random access response PDCCH counter, wherein therandom access preamble transmission counter is used for recording numberof times of transmission of the random access preambles, the randomaccess response PDCCH counter is used for recording number of times thatthe PDCCH of the random access radio network temporary identify matchedwith the second ROs is not searched in a random access response searchwindow; the performing random access according to the available secondROs, includes:

if the value of the random access preamble transmission counter isgreater than or equal to a configured threshold for switching randomaccess configuration information or the value of the random accessresponse PDCCH counter is greater than or equal to the threshold forswitching random access configuration information, then performing anyone of the following operations:

switching to the random access configuration information for presence oflong-range interference from the current random access configurationinformation for no long-range interference, and performing a subsequentrandom access attempt in this random access according to the switchedrandom access configuration information for presence of long-rangeinterference;

switching to the random access configuration information for nolong-range interference from the current random access configurationinformation for presence of long-range interference, and performing asubsequent random access attempt in this random access according to theswitched random access configuration information for no long-rangeinterference.

Further, the method further includes:

obtaining random access configuration selection indication informationconfigured by a base station.

Further, the obtaining random access configuration selection indicationinformation configured by a base station, through one or more of thefollowing:

a system information-radio network temporary identity (SI-RNTI)scrambles a physical downlink control channel (PDCCH) in a systeminformation search space of cyclic redundancy code check (CRC);

a paging-radio network temporary identity (P-RNTI) scrambles a PDCCH ina paging search space of the CRC;

random access-radio network temporary identity (RA-RNTI) scrambles aPDCCH in a random access search space of the CRC;

temporary cell-radio network temporary identify (TC-RNTI) or the C-RNTIscrambles a PDCCH in a search space of the CRC;

radio network-temporary identify specific to random access configurationinformation (RACI-RNTI) scrambles a PDCCH in a search space of the CRC;

radio network temporary identity common to other user groups scrambles aPDCCH in a search space of the CRC;

system information; and

RRC signaling.

Further, the performing random access according to the available secondROs, including:

performing random access according to the available second ROs, in atransmission time period in which the random access configurationselection indication information is received, based on the random accessconfiguration information indicated by the random access configurationselection indication information; or performing random access accordingto the available second ROs in a next transmission time period of thetransmission time period in which the random access configurationselection indication information is received, based on the random accessconfiguration information indicated by the random access configurationselection indication information; the transmission time period includesany one of the following:

an SSB period; a PRACH configuration period; a paging period; aconfigured modification period; and an association time period from SSBto RO.

The following describes the random access method of the foregoingembodiment of the present application in a comprehensive and detailedmanner:

specifically, in this embodiment, in some communication systems thatconsider RIM, the UE may autonomously select a new random accessresource configuration by the method provided in this embodiment orselect a new random access configuration based on the indication of thebase station equipment; thereby achieving the purpose of improving thesuccess rate of random access.

Specifically, the UE obtains configuration information of the networkfrom the network side through system information or RRC configurationmessage or the downlink control channel, and includes one or more of thefollowing:

random access configuration information for no-range distanceinterference; including one or more of the following:

PRACH configuration period;

time unit index of RO (such as slot index, symbol index, subframe index,etc.);

frequency domain unit index of RO (such as carrier index, BWP index, PRBindex, subcarrier index, etc.);

number of ROs;

random access preamble format (such as CP length, preamble sequencelength and repetition number, GT length, used subcarrier size, etc.);

number of random access preambles, the index of the root sequence, andthe cyclic shift value;

number of SSBs that can be mapped on one RO.

random access configuration information for presence of long distanceinterference;

including one or more the following:

PRACH configuration period;

time unit index of RO (such as slot index, symbol index, subframe index,etc.);

frequency domain unit index of RO (such as carrier index, BWP index, PRBindex, subcarrier index, etc.);

number of ROs;

random access preamble format (such as CP length, preamble sequencelength and repetition number, GT length, used subcarrier size, etc.);

number of random access preambles, the index of the root sequence, andthe cyclic shift value;

number of SSBs that can be mapped on one RO;

threshold for switching random access configuration information.

SSB configuration information; including one or more of the following:

size of SSB period;

number of SSBs transmitted in one SSB period;

time unit locations of the SSBs transmitted in one SSB period;

frequency domain unit location of the SSBs transmitted in one SSBperiod.

The UE may obtain association information (different associationinformation from SSB to RO may be obtained based on different randomaccess configuration information) from SSB to RO based on the aboverandom access configuration information (for random access configurationinformation for no long-range interference or random accessconfiguration information for presence of long-range interference) andSSB configuration information, including one or more the following:

association period from SSB to RO (for example, the number of PRACHconfiguration period required to complete at least one association fromSSB to RO);

association pattern period from SSB to RO (for example, a time durationthat ensure the associations from SSB to RO in the two adjacentassociation pattern period are exactly the same, for example, number ofrequired association periods from SSB to RO, or number of required PRACHconfiguration period).

The UE first sets a random access preamble transmission counter to 0, apreamble power ramping counter to 0, and a random access response PDCCHcounter (RAR_PDCCH_counter) to 0 based on current default (orpre-selected) random access configuration information (e.g., randomaccess configuration information for no long-range interference, and forexample, random access configuration information for presence oflong-range interference) and the association information from SSB to RO.Then determining the available RO according to the selected SSB and thedetermined association information, and transmitting a random accesspreamble on the determined available RO, that is, determining theavailable RO according to the configured SSB based on the determinedassociation information from the SSB to RO, and transmitting the randomaccess preamble on the determined available RO, and then using a randomaccess-radio network temporary identifier (RA-RNTI) associated to thedetermined RO, searching for possible PDCCH on the configured downlinkresources and in the random access response window (RAR window), whereinthe RAR_PDCCH_counter is for recording the number of times that the UEdoes not search for the PDCCH matching to the RA-RNTI in the entire RARwindow. The present application proposes two ways, so that the UE mayautonomously switch from random access based on default (orpre-selected) random access configuration information to random accessbased on another random access configuration information, for example,switching from a random access configuration information based on nolong-range interference to the random access configuration informationfor the presence of long-range interference. Specifically:

1. The UE does not search for the PDCCH in the entire RAR window, orsearches for the PDCCH and decodes the RAR carried by the correspondingPDSCH, but the RAR does not have a random access preamble index (RAPID)transmitted by the corresponding UE; the UE will transmit the new randomaccess preamble; if the UE's random access preamble transmission counterexceeds (not less than) the threshold for switching random accessconfiguration information, the UE autonomously switches the randomaccess configuration information for no long-range interference to therandom access configuration information for presence of long-rangeinterference; and uses the random access configuration information forpresence of long-range interference to perform subsequent random accessin the random access attempt.

2. The UE does not search for the PDCCH in the entire RAR window, andthe RAR_PDCCH_counter is incremented by one. If the UE searches for thePDCCH matching the RA-RNTI in the RAR window, the RAR_PDCCH_counterremains unchanged, even if the RAR carried in the scheduled PDSCH doesnot have a matching RAPID. When the RAR_PDCCH_counter exceeds (or notless than) the threshold for switching random access configurationinformation, the UE autonomously switches to the random connection forthe presence of long-range interference from the random accessconfiguration information for no long-range interference; and uses therandom access configuration information for presence of long-rangeinterference to perform the subsequent random access attempt in thisrandom access procedure.

Furthermore, in addition to the UE autonomously selecting a new randomaccess resource configuration, the present application further providesa manner in which the UE receives the indication of the base stationequipment to select new random access configuration resources. The UEobtains N pieces of random access configuration information from thenetwork side, and the network side notifies the user of thespecifically-used random access configuration information by the randomaccess configuration selection indication. For example, the UE obtainsN=2 pieces of random access configuration information from the networkside (for example, one piece of random access configuration informationfor no long-range interference, and one piece of random accessconfiguration information for presence of long-range interference), thenetwork equipment notifies the UE which random access configuration touse by M=┌log₂N┐ (┌x┐ represents the minimum integer greater than x)bits, for example, N=2, then M=1. The UE may obtain the random accessconfiguration selection indication information by using one or more ofthe following:

1. using the SI-RNTI (system information-RNTI) to scramble the downlinkcontrol channel in the system information search space of the cyclicredundancy check (CRC);

2. using P-RNTI (paging-RNTI) to scramble the downlink control channelin the paging search space of the CRC;

3. using RA-RNTI (random access-RNTI) to scramble the downlink controlchannel in the random access search space of the CRC;

4. using TC-RNTI or C-RNTI to scramble the downlink control channel inthe search space of the CRC;

5. random access configuration indication-RNTI (RACI-RNTI) dedicated tothe random access configuration selection indication scrambles thedownlink control channel in the search space of the CRC;

6. the radio network temporary identifier common to other user groups(for example, SFI-RNTI (slot format indication—RNTI) indicated by theslot format, interruption-RNTI (INT-RNTI), transmit powercontrol-physical uplink shared channel-RNTI (TPC-PUSCH-RNTI), transmitpower control-sounding reference signal-RNTI (TPC-SRS-RNTI));

7. system information; and

8. RRC signaling.

Specifically, if N=2, the random access configuration selectionindication information (or the RI has indication information) may alsobe indicated by “true” or “false”, for example, if the indication is“true”, the random access configuration information for presence oflong-range interference is used, and if the indication is “false”, therandom access configuration information for no long-range interferenceis used.

After obtaining the random access configuration selection indicationinformation, the UE may:

1. prepare a possible random access transmission by using the indicatedrandom access configuration immediately after receiving all the timeunits of the random access configuration selection indicationinformation; or

2. after receiving the random access configuration selection indicationinformation in a time period, prepare the possible random accesstransmission by using the indicated random access configuration at thebeginning of the next time period; before the beginning of the next timeperiod, preparing a possible random access transmission with theprevious random access configuration; the time period may be one or moreof the following:

a) SSB period;

b) PRACH configuration period;

c) paging period;

d) configured modification period;

e) association period of the SSB-RO; and

f) association pattern period of the SSB-RO.

FIG. 7 is a schematic structural diagram of a terminal equipmentaccording to an embodiment of the present disclosure. As shown in FIG. 7, the terminal equipment 70 may include a first receiving module 71, afirst determination module 72, and a first access module 73, wherein:

the first receiving module 71 is configured to receive configurationinformation for random access from a base station;

the first determination module 72 is configured to determine availablefirst ROs, according to at least one configured channel stateinformation reference signal (CSI-RS), based on the configurationinformation;

the first access module 73 is configured to perform random accessaccording to the available first ROs.

Specifically, the configuration information includes one or more ofrandom access configuration information, SSB configuration information,or CSI-RS configuration information;

The random access configuration information includes one or more of thefollowing:

PRACH configuration period; frequency-domain unit index of RO;time-frequency unit index of RO; number of ROs; format of random accesspreamble; number of random access preambles; root sequence index ofrandom access preambles; cyclic shift value of random access preamble;number of SSBs that can be mapped on one RO; index of at least oneCSI-RS for random access; number of ROs mapped by one CSI-RS; and indexof at least one RO mapped by one CSI-RS.

The SSB configuration information includes one or more of the following:

size of SSB period; number of SSBs transmitted in one SSB period;indexes of SSBs transmitted in one SSB period; time unit locations ofSSBs transmitted in one SSB period; frequency-domain unit locations ofSSBs transmitted in one SSB period;

CSI-RS configuration information includes one or more of the following:

size of CSI-RS period; number of CSI-RSs transmitted in one CSI-RSperiod; indexes of CSI-RSs transmitted in one CSI-RS period; time unitlocations of CSI-RSs transmitted in one CSI-RS period; frequency-domainunit locations of CSI-RSs transmitted in one CSI-RS period.

Further, the first determination module is specifically configured todetermine a indexing time period of the RO based on the configurationinformation, and determining the available first RO according to the atleast one configured CSI-RS based on the indexing time period.

Further, the first determination module is specifically configured todetermine a target CSI-RS for determining a RO according to the at leastone configured CSI-RS; and determine the available first RO associatedto the target CSI-RS based on the indexing time period and an index ofat least one RO mapped by the target CSI-RS.

Further, the first determination module is specifically configured to:if there is one configured CSI-RS, the configured CSI-RS is determinedas the target CSI-RS; if there are multiple configured CSI-RSs, anyCSI-RS selected randomly from the multiple CSI-RSs with a mediumprobability is determined as the target CSI-RS; and the CSI-RS havingthe highest reference signal received power among the multiple CSI-RSsis determined as the target CSI-RS.

Further, the first determination module is specifically configured toindex at least one RO in each indexing time period according to apredetermined manner respectively, to obtain a time-frequency resourcelocation associated to each RO, wherein the RO represents an initialindex reset of the RO in each indexing time period by an index; anddetermine the time-frequency resource location of the available first ROassociated to the target CSI-RS based on a predefined associationrelationship between the CSI-RS and/or the RO and an index of at leastone RO mapped by the target CSI-RS.

Further, the first determination module is specifically configured todetermine first association information from SSB to RO and secondassociation information from CSI-RS to RO, the first associationinformation comprises an association period from SSB to the RO and/or anassociation pattern period from SSB to RO, the second associationinformation comprises an association period from CSI-RS to ROs and/or anassociation pattern period from the CSI-RS to RO; obtain a PRACHconfiguration period from the configuration information; compute a timeduration in which each CSI-RS configured in one CSI-RS period iscompletely mapped to a corresponding RO, according to the configurationinformation; and

compute a time duration in which each SSB configured in one SSB periodis completely mapped to a corresponding ROs, according to theconfiguration information.

Further, the indexing time period includes any one of the following:

an association period from CSI-RS to RO;

an association pattern period from CSI-RS to RO;

an association period from SSB to RO;

an association pattern period from SSB to RO;

PRACH configuration period;

a time duration in which each CSI-RS configured in one CSI-RS period iscompletely mapped to a corresponding RO; and

a time duration in which each SSB configured in one SSB period iscompletely mapped to a corresponding RO.

Further, the first determination module is specifically configured toindex indexes of all the ROs in each indexing time period according tothe predetermined manner; or for any indexing time period, select validROs from ROs in the indexing time period based on a predeterminedselection rule, and index indexes of the valid ROs according to thepredetermined manner; or for any indexing time period, select valid ROsfrom ROs in the indexing time period based on a predetermined selectionrule, and select ROs to be indexed from the valid ROs, and index indexesof the ROs to be indexed according to the predetermined manner.

Further, the first determination module is specifically configured toselect ROs to be indexed from the valid ROs according to the minimumnumber of valid ROs in each indexing time period and the time-frequencyresource locations of the minimum number of valid ROs in thecorresponding indexing time period.

Further, the first access module is specifically configured to performrandom access according to the first ROs if there is one time-frequencyresource location of available first ROs; or if there are multipletime-frequency resource locations of available first ROs, one or more ofthe following operations is performed:

determining an index with the lowest index value in the available firstROs associated to multiple time-frequency resources locations, andperforming random access according to the ROs with the lowest indexvalue; randomly selecting any first ROs from the valid first ROsassociated to multiple time-frequency resource locations with a mediumprobability, and performing random access according to any first Ros;determining the first available first ROs in the available first ROsassociated to multiple time-frequency resource locations, and performingrandom access according to the first available first ROs, wherein thefirst available first ROs is the first available first ROs after a UEcompletes a preparation of transmission of random access preambles.

Compared with the prior art, the equipment provided by the embodiment ofthe present application receives the configuration information for therandom access from the base station, and provides the premise guaranteefor the subsequent random access;

and determine the available first ROs according to the at least oneconfigured CSI-RS based on the configuration information, so that the UEcan determine the time-frequency resources for random access through theindication of the configured CSI-RS, providing more ways of performingrandom access while laying the basis for subsequent random access;

the random access is performed according to the available first ROs, sothat random access is quickly performed according to the ROs determinedby the CSI-RS.

FIG. 8 illustrates a schematic structural diagram of a terminalequipment according to an embodiment of the present application. Asshown in FIG. 8 , the terminal equipment 80 may include a secondreceiving module 81, a second determination module 82, and a secondaccess module 83, wherein:

the second receiving module 81 is configured to receive configurationinformation for random access from a base station;

the second determination module 82 is configured to determine availablesecond ROs, according to at least one configured SSB, based on theconfigured information; and

the second access module 83 is configured to perform random accessaccording to the available second ROs.

Specifically, the configuration information includes one or more ofrandom access configuration information for no long-range interference,random access configuration information for presence of long-rangeinterference, or SSB configuration information.

Further, the second determination module 82 is specifically configuredto determine third association information between SSB and RO accordingto first configuration information or second configuration information,the first configuration information comprises current random accessconfiguration information for no long-range interference and the SSBconfiguration information, the second configuration informationcomprises current random access configuration information for presenceof long-range interference and the SSB configuration information; anddetermine available second ROs according to at least one configured SSBbased on the third association information.

Further, an initialization module (not shown) is further included, theinitialization module is specifically configured to initialize randomaccess preamble transmission counter, preamble power ramping counter andrandom access response PDCCH counter, wherein the random access preambletransmission counter is used for recording number of times oftransmission of the random access preambles, the random access responsePDCCH counter is used for recording number of times that the PDCCH ofthe random access radio network temporary identify matched with thesecond RO is not searched in a random access response search window.

Wherein, the second access module 83 is specifically configured to: ifthe value of the random access preamble transmission counter is greaterthan or equal to a configured threshold for switching random accessconfiguration information or the value of the random access responsePDCCH counter is greater than or equal to the threshold for switchingrandom access configuration information, then performing any one of thefollowing operations:

switching to the random access configuration information for presence oflong-range interference from the current random access configurationinformation for no long-range interference, and performing a subsequentrandom access attempt in this random access according to the switchedrandom access configuration information for presence of long-rangeinterference;

switching to the random access configuration information for nolong-range interference from the current random access configurationinformation for presence of long-range interference, and performing asubsequent random access attempt in this random access according to theswitched random access configuration information for no long-rangeinterference.

Further, the equipment further includes an obtaining module (not shown)for obtaining random access configuration selection indicationinformation configured by the base station.

Further, the obtaining module is specifically configured to obtainrandom access configuration selection indication information configuredby the base station by using one or more of the following:

system information-radio network temporary identity (SI-RNTI) scramblinga physical downlink control channel (PDCCH) in a system informationsearch space of cyclic redundancy code check (CRC);

paging-radio network temporary identity (P-RNTI) scrambling a PDCCH in apaging search space of the CRC;

random access-radio network temporary identity (RA-RNTI) scrambling aPDCCH in a random access search space of the CRC;

temporary cell-radio network temporary identify (TC-RNTI) or the C-RNTIscrambling a PDCCH in a search space of the CRC;

radio network-temporary identify specific to random access configurationinformation (RACI-RNTI) scrambling a PDCCH in a search space of the CRC;

radio network temporary identity common to other user groups scramblinga PDCCH in a search space of the CRC;

system information; and

RRC signaling.

Further, the second access module 83 is specifically configured toperform random access according to the available second ROs, in atransmission time period in which the random access configurationselection indication information is received, based on the random accessconfiguration information indicated by the random access configurationselection indication information; or, perform random access according tothe available second ROs in a next transmission time period of thetransmission time period in which the random access configurationselection indication information is received, based on the random accessconfiguration information indicated by the random access configurationselection indication information;

the transmission time period includes any one of the following:

SSB period; PRACH configuration period; paging period; a configuredmodification period; an association time period from SSB to RO.

Compared with the prior art, the device provided by the embodiment ofthe present application receives the configuration information for therandom access from the base station, and provides the premise guaranteefor the subsequent determination of the ROs; and determines theavailable the second ROs according to the configured at least one SSBbased on the configuration information so that the UE can determine thetime-frequency resources for random access through the indication of theconfigured SSB, providing more ways of performing random access whilelaying the basis for subsequent random access. The random access isperformed according to the available first ROs, so that random access isquickly performed according to the ROs determined by the SSB, and the UEcan perform autonomous handover in the presence of long-rangeinterference, thereby increasing the probability of successful randomaccess.

Another embodiment of the present invention provides a terminalequipment comprising: a processor; and a memory configured to storemachine readable instructions that, when executed by the processor,cause the processor to perform the above random access method.

FIG. 9 illustrates a block diagram that schematically illustrates acomputing system according to an embodiment of the present disclosurethat can be used to implement the UE of the present disclosure.

As shown in FIG. 9 , a computing system 900 includes a processor 910, acomputer readable storage medium 920, an output interface 930, and aninput interface 940. The computing system 900 may perform the methoddescribed above with reference to FIG. 2 or FIG. 6 to configure areference signal and perform data transmission based on the referencesignal.

In particular, the processor 910 may include, for example, a generalpurpose microprocessor, an instruction set processor, and/or a relatedchipset and/or a special purpose microprocessor (e.g., an applicationspecific integrated circuit (ASIC)), and the like. The processor 910 mayalso include an onboard memory for caching purposes. The processor 910may be a single processing unit or a plurality of processing units forperforming different actions of the method flow described with referenceto FIG. 2 or FIG. 6 .

The computer readable storage medium 920, for example, may be any mediumthat can contain, store, communicate, propagate or transport theinstructions. For example, a readable storage medium may include, but isnot limited to, an electronic, magnetic, optical, electromagnetic,infrared, or semiconductor system, apparatus, device, or propagationmedium. Specific examples of the readable storage medium include: amagnetic storage apparatus such as a magnetic tape or a hard disk (HDD);an optical storage apparatus such as a compact disk (CD-ROM); a memorysuch as a random access memory (RAM) or a flash memory; and/or awired/wireless communication link.

The computer readable storage medium 920 may include a computer program,which may include codes/computer executable instructions that, whenexecuted by the processor 910, cause the processor 910 to perform, forexample, the method flow described above in combination with FIG. 2 orFIG. 6 and any variations thereof.

The computer program may be configured to have, for example, computerprogram codes including a computer program module. For example, in anexample embodiment, the codes in the computer program may include one ormore program modules, including, for example, module 1, module 2, . . .. It should be noted that the division manner and number of modules arenot fixed, and those skilled in the art may use suitable program modulesor program module combinations according to actual cases. When theseprogram module combinations are executed by the processor 910, theprocessor 910 may perform, for example, the method flow described abovein connection with FIG. 2 or FIG. 6 and any variations thereof.

According to an embodiment of the present disclosure, the processor 910may use the output interface 930 and the input interface 940 to performthe method flow described above in connection with FIG. 2 or FIG. 6 andany variations thereof.

It should be understood that although the various steps in the flowchartof the drawings are sequentially displayed as indicated by the arrows,these steps are not necessarily performed in the order indicated by thearrows. Except as explicitly stated herein, the execution of these stepsis not strictly limited, and may be performed in other sequences.Moreover, at least some of the steps in the flowchart of the drawingsmay include a plurality of sub-steps or stages, which are notnecessarily performed at the same time, but may be executed at differenttimes, and the execution order thereof is also not necessarily performedsequentially, but may be performed alternately or alternately with atleast a portion of other steps or sub-steps or stages of other steps.

Although the present disclosure has been described with variousembodiments, various changes and modifications may be suggested to oneskilled in the art. It is intended that the present disclosure encompasssuch changes and modifications as fall within the scope of the appendedclaims.

What is claimed is:
 1. A method performed by a user equipment (UE) in awireless communication system, the method comprising: receiving, from abase station, configuration information for random access, wherein theconfiguration information includes at least one channel stateinformation-reference signal (CSI-RS) indexes and at least one physicalrandom access channel occasions (ROs) corresponding to each of the atleast one CSI-RS indexes; determining ROs associated with the at leastone CSI-RS based on the configuration information; and performing arandom access according to the ROs, wherein an indexing of ROs is resetper an association pattern period, and wherein the association patternperiod includes one or more association periods and is associated with apattern based on a synchronization signal block (SSB) and the ROs. 2.The method according to claim 1, wherein the indexing of the ROs issequentially numbered.
 3. A method performed by a base station in awireless communication system, the method comprising: transmitting, to auser equipment (UE), configuration information for random access,wherein the configuration information includes at least one channelstate information-reference signal (CSI-RS) indexes and at least onephysical random access channel occasions (ROs) corresponding to each ofthe at least one CSI-RS indexes, wherein ROs associated with the atleast one CSI-RS is determined based on the configuration information,wherein a random access is performed according to the ROs, wherein anindexing of ROs is reset per an association pattern period, and whereinthe association pattern period includes one or more association periodsand is associated with a pattern based on a synchronization signal block(SSB) and the ROs.
 4. The method according to claim 3, wherein theindexing of the ROs is sequentially numbered.
 5. A user equipment (UE)comprising: a transceiver to transmit and receive at least one signal;and at least one processor coupled to the transceiver, and configuredto: receive, from a base station, configuration information for randomaccess, wherein the configuration information includes at least onechannel state information-reference signal (CSI-RS) indexes and at leastone physical random access channel occasions (ROs) corresponding to eachof the at least one CSI-RS indexes, determine ROs associated with the atleast one CSI-RS based on the configuration information, and perform arandom access according to the ROs, wherein an indexing of ROs is resetper an association pattern period, and wherein the association patternperiod includes one or more association periods and is associated with apattern based on a synchronization signal block (SSB) and the ROs. 6.The UE according to claim 5, wherein the indexing of the ROs issequentially numbered.
 7. A base station comprising: a transceiver totransmit and receive at least one signal; and at least one processorcoupled to the transceiver, and configured to: transmit, to a userequipment (UE), configuration information for random access, wherein theconfiguration information includes at least one channel stateinformation-reference signal (CSI-RS) indexes and at least one physicalrandom access channel occasions (ROs) corresponding to each of the atleast one CSI-RS indexes, wherein ROs associated with the at least oneCSI-RS is determined based on the configuration information, wherein arandom access is performed according to the ROs, wherein an indexing ofROs is reset per an association pattern period, and wherein theassociation pattern period includes one or more association periods andis associated with a pattern based on a synchronization signal block(SSB) and the ROs.
 8. The base station according to claim 7, wherein theindexing of the ROs is sequentially numbered.